InChI=1S/C19H17NO9S/c1-20-16-9(3-2-4-11(16)21)18(23)15-12(22)6-13-10(17(15)20)5-14(29-13)19(7-27-19)8-28-30(24,25)26/h2-4,6,14,21-22H,5,7-8H2,1H3,(H,24,25,26)